If he's changed his mind on that, what's to say he won't change his mind again? Did some big scientific finding come out between now and then?Many have. Some have been killed for it.
Fauci has changed his tune on masks. He's allowed to do that. I in fact appreciate a willingness to change the policy based on further consideration and experience. Wearing masks was originally being touted as help prevent the wearer from being infected. Fauci was disputing that, saying that the protection provided to the wearer by hospital masks (not the full N95 surgical masks) was minimal and could be offset by increasing hands-to-face touching and the like. They've now weighed those considerations against the protection masks provide for transmission from the wearer, and have decided there is a net benefit.
He's following the trend, just like everyone else is.
If they were that effective, why aren't we opening everything up and requiring everyone to wear a mask?